Malicious PDF — malware analysis report

Static analysis result for SHA-256 55697df24448d3a6…

MALICIOUS

PDF

34.8 KB Authoring application: Smallpdf Desktop
MD5: d80679b0bb40c39904bdcbda4f5bfa43 SHA-1: 4bd6e4b37a88bcee49bf7a79c2add8b5dca5e45a SHA-256: 55697df24448d3a6342d63770366fddfa67dd291ede7ea2f6653022465b9e958
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF_SEO_LINK_FARM heuristic identified a large number of embedded external links pointing to various domains, suggesting a link farm or phishing infrastructure. The document body contains text related to 'critical appraisal' and 'literature review', which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://prolinelifepharmaceutical.com/uploads/1/3/0/5/130588527/lofowokodo.pdf
    • http://fretbuzz.info/uploads/1/3/0/5/130590724/e98e0b1a64b12b.pdf
    • http://nicholaspaulmccarty.com/uploads/1/3/0/6/130621003/vuruv-bedunuviropo-zituxetab.pdf
    • http://quintepaddlingclub.com/uploads/1/3/0/3/130313643/gejagefesudigo.pdf
    • http://brown-sugar.com.au/uploads/1/3/0/6/130639348/jojujipi_nitewibaz.pdf
    • http://mytutoringgroup.com/uploads/1/3/0/5/130539316/ef5a96c5eb.pdf
    • http://north42sales.ca/uploads/1/3/0/6/130604606/tatirugonedonid_kofonemuteva.pdf
    • http://aspenfamilymedicine.com/uploads/1/3/0/5/130590399/basafatapifi.pdf
    • http://caddielands.com/uploads/1/3/0/4/130477775/9563909.pdf
    • http://cecilyeiferle.com/uploads/1/3/0/3/130313235/130313235.html#which+casp+tool+to+use+for+literature+review

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001264.bin
a1cb967eb511fc07c9d3b2455df7468331d77873c81cf2f171fe20fe05c5f3e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1264 8076 bytes

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